I found some EPUBs cannot be loaded correctly. This issue happened on all platforms (Windows, Android, iOS. I don't have mac devices, but I guess it would exist on mac as well).
SCENARIO 1: Non-English Characters cannot be displayed correctly.
Not all EPUB files have this problem.
SCENARIO 2: Photos cannot be displayed completely in screen.
Again, not all files have this problem. As I cannot attach a file, I can only show screenshots here.
For this issue, one of the reasons I guess is the picture is much larger than the screen. But why not zoom it to show a full scene?
I have sample files for the two issues. So please let me know how I can send you.
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